Booting to PXE (or iPXE) using dnsmasq is rather well documented also by Me ;-).
If You would like to use MikroTik it's not so easy (at least v6.43.2). I couldn't manage to boot iPXE using chainloading because of the infinite loop with the DHCP server.
Booting from PXE is also not so obvious. You cannot set option 66 (next-server/Server-Name) nor 67 (boot-file/Bootfile-Name) in "ip dhcp-server option". Instead set "Next Server" and "Boot File Name" in "ip dhcp-server network", so it should look like this:
[admin@MikroTik] > /ip dhcp-server network print detail
Flags: D - dynamic
0 ;;; defconf
address=192.168.1.0/24 gateway=192.168.1.15 netmask=24
dns-server=192.168.1.28,192.168.1.15 wins-server="" ntp-server=""
caps-manager="" domain="lan" next-server=192.168.1.28
boot-file-name="pxelinux.0" dhcp-option="" dhcp-option-set=""
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